Laser-field-free molecular orientation with combined electrostatic and rapidly-turned-off laser fields
Laser-field-free molecular orientation with combined electrostatic and rapidly-turned-off laser fields
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DOI：
10.1103/physreva.77.031403
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发表时间：
2008-03
影响因子：
2.9
通讯作者：
Y. Sugawara;A. Goban;S. Minemoto;H. Sakai
中科院分区：
文献类型：
--
作者：
Y. Sugawara;A. Goban;S. Minemoto;H. Sakai
我们提出了一种策略，以实现激光场自由分子取向的静电场和一个强大的，非共振激光场与快速关闭的组合。在激光脉冲的快速关闭之后，绝热产生的摆动态被有效地转移到非绝热区域中的旋转波包，并且在激光脉冲的峰值处实现的取向在具有相同取向度的分子的旋转周期处被恢复。分子行为在排列和取向之间存在显着差异，这揭示了激光脉冲足够长的上升时间对于实现最高可能程度的取向的至关重要性。在实际的实验条件下，OCS分子作为样品的可行性已被检查。
We propose a strategy to achieve laser-field-free molecular orientation with the combination of an electrostatic field and an intense, nonresonant laser field with rapid turn off. The adiabatically created pendular state is effectively transferred to the rotational wave packet in the nonadiabatic regime after the rapid turn off of the laser pulse and the orientation achieved at the peak of the laser pulse is revived at the rotational period of the molecule with the same degree of orientation. The remarkable difference in molecular behavior is found between alignment and orientation, which reveals the crucial importance of the sufficiently long rising time of the laser pulse to achieve the highest possible degree of orientation. The feasibility has been examined for OCS molecules as a sample under practical experimental conditions.